Answer:
a = 9
Step-by-step explanation:
-6a + 2a = -36
-4a = -36
a = -36/-4
a = 9
The value of y for the system of equation is -1/2 .
<h3>What is a System of Equation ?</h3>
A system of equation is a set of equation that have common solution
The set of equation given is
3x+4y=4
2x−4y=6
To solve the system , Elimination method will be used
Add equation 1 and 2 to eliminate y
5x = 10
x = 2
Substitute the value of x in equation 1 to determine y
3x +4y = 4
6 + 4y = 4
4y = -2
y = -1/2
Therefore the value of y for the system of equation is -1/2 .
To know more about System of Equation
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Answer:
16 questions answered correctly
Step-by-step explanation:
Since the student answered 80% of the questions correctly, we can find 80% of 20 to answer this question.
[] First we will convert the percent into a decimal format;
80% / 100 = 0.8
[] Then we will multiply this by 20 to find our answer;
20 * 0.8 = 16 questions answered correctly
Answer:
y=-3
Step-by-step explanation: